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href="/categories/JavaScript%E7%AC%94%E8%AE%B0/">JavaScript笔记</a></span></div><div class="meta-secondline"><span class="post-meta-separator">|</span><span data-flag-title="JavaScript 第五天"><i class="far fa-eye fa-fw post-meta-icon"></i><span class="post-meta-label">阅读量:</span><span id="twikoo_visitors"><i class="fa-solid fa-spinner fa-spin"></i></span></span></div></div></div></header><main class="layout" id="content-inner"><div id="post"><article class="post-content" id="article-container"><h3 id="1-什么是对象"><a href="#1-什么是对象" class="headerlink" title="1. 什么是对象:"></a>1. 什么是对象:</h3><ol><li>对象是一种数据类型, 是一种无序的数据集合</li><li>用多个变量保存散乱, 用对象比较统一</li><li>保存用户信息, 姓名年龄电话…用之前的数据类型不方便, 很难区分</li></ol><h4 id="1-对象是属性和方法组成"><a href="#1-对象是属性和方法组成" class="headerlink" title="1. 对象是属性和方法组成:"></a>1. 对象是属性和方法组成:</h4><ul><li>属性: 信息或特征 (名词), 比如手机尺寸、颜色、重量…</li><li>方法: 功能或行为 (动词), 比如打电话、发短信、玩游戏…</li></ul><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">let</span> 对象名 = &#123;</span><br><span class="line">    属性名: 属性值,</span><br><span class="line">    方法名: 函数</span><br><span class="line"> &#125;</span><br></pre></td></tr></table></figure><ol><li>对象属性没有顺序, 属性和值<strong>用 : 隔开</strong> 多个属性<strong>用 ; 逗号隔开</strong></li><li>可使用””或’’ , 一般省略, 除非遇到特殊符号 空格、中横线等</li></ol><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">let</span> num1 = &#123;</span><br><span class="line">    <span class="attr">name</span>: <span class="string">&#x27;mark&#x27;</span>,</span><br><span class="line">    <span class="attr">age</span>: <span class="number">10</span></span><br><span class="line">&#125;</span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">dir</span>(num1)</span><br></pre></td></tr></table></figure><h4 id="2-属性访问"><a href="#2-属性访问" class="headerlink" title="2. 属性访问:"></a>2. 属性访问:</h4><ol><li>简单理解就是<strong>获得对象里的属性值</strong></li><li>两种方式: 1. 点形式: 对象.属性 2. []形式: 对象[‘属性’]</li><li><strong>1. 点属性名不要加引号 2. []属性名加引号 3. 后期不同场景会用到不同写法</strong></li></ol><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">let</span> num = &#123;</span><br><span class="line">    <span class="attr">name</span>: <span class="string">&#x27;Mark&#x27;</span>,</span><br><span class="line">    <span class="attr">age</span>: <span class="number">20</span>,</span><br><span class="line">    <span class="attr">sex</span>: <span class="string">&#x27;男&#x27;</span></span><br><span class="line">&#125;</span><br><span class="line"><span class="variable language_">document</span>.<span class="title function_">write</span>(num.<span class="property">age</span>)</span><br><span class="line"><span class="variable language_">document</span>.<span class="title function_">write</span>(num[<span class="string">&#x27;sex&#x27;</span>])</span><br></pre></td></tr></table></figure><h4 id="3-对象中的方法和访问"><a href="#3-对象中的方法和访问" class="headerlink" title="3. 对象中的方法和访问:"></a>3. 对象中的方法和访问:</h4><ol><li><p>数据行为信息叫方法, 方法名和函数构成, 使用 : 分隔</p></li><li><p>多个属性使用英文 , 分隔</p></li><li><p>方法名可使用” “或’’，一般省略, 除非遇到特殊符号空格、中横线等</p></li><li><p>声明对象, 添加若干方法后, 可使用 . 调用对象函数, 称为方法调用</p></li><li><p>对象.方法(), person.sayHi()</p></li><li><p>注意: 别忘了给方法名后面加小括号</p></li></ol><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 对象中使用匿名函数</span></span><br><span class="line"><span class="keyword">let</span> num = &#123;</span><br><span class="line">    <span class="attr">say</span>: <span class="keyword">function</span> (<span class="params"></span>) &#123;</span><br><span class="line">        <span class="variable language_">document</span>.<span class="title function_">write</span>(<span class="string">&#x27;你好&#x27;</span>)</span><br><span class="line">    &#125;,</span><br><span class="line">    <span class="attr">say1</span>: <span class="keyword">function</span> (<span class="params">a</span>) &#123; <span class="comment">// 传参</span></span><br><span class="line">        <span class="variable language_">document</span>.<span class="title function_">write</span>(a)</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br><span class="line"><span class="comment">// 调用方法 对象.方法名()</span></span><br><span class="line">num.<span class="title function_">say</span>()</span><br><span class="line">num.<span class="title function_">say1</span>(<span class="string">&#x27;你好&#x27;</span>)</span><br></pre></td></tr></table></figure><h3 id="2-操作对象"><a href="#2-操作对象" class="headerlink" title="2. 操作对象"></a>2. 操作对象</h3><ol><li>操作数据无非是增删改查</li><li>查询对象: 对象.属性、对象[‘属性’]、对象.方法()</li><li>重新赋值: 对象.属性 &#x3D; 值、对象.方法 &#x3D; function() {}</li><li>对象添加新的数据: 对象名.新属性名 &#x3D; 新值</li><li>删除对象中属性: delete 对象名.属性名 (了解)</li></ol><h5 id="1-增加对象属性"><a href="#1-增加对象属性" class="headerlink" title="1. 增加对象属性"></a>1. 增加对象属性</h5><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line">num3.<span class="property">sex</span> = <span class="string">&#x27;男&#x27;</span></span><br><span class="line">num3.<span class="property">say3</span> = <span class="keyword">function</span> (<span class="params"></span>) &#123;</span><br><span class="line">    <span class="variable language_">document</span>.<span class="title function_">write</span>(<span class="number">22</span>)</span><br><span class="line">&#125;</span><br><span class="line"><span class="variable language_">document</span>.<span class="title function_">write</span>(num3.<span class="property">sex</span>)</span><br><span class="line">num3.<span class="title function_">say3</span>()</span><br></pre></td></tr></table></figure><h5 id="2-重新赋值对象属性"><a href="#2-重新赋值对象属性" class="headerlink" title="2. 重新赋值对象属性"></a>2. 重新赋值对象属性</h5><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 无论是属性或方法, 同一对象中名称一样, 后面的会覆盖前面的</span></span><br><span class="line"><span class="comment">// 重新赋值对象属性值</span></span><br><span class="line"><span class="keyword">let</span> num1 = &#123;</span><br><span class="line">    <span class="attr">age</span>: <span class="number">10</span>,</span><br><span class="line">    <span class="attr">say</span>: <span class="keyword">function</span> (<span class="params"></span>) &#123;</span><br><span class="line">        <span class="variable language_">document</span>.<span class="title function_">write</span>(<span class="number">2</span>)</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br><span class="line"><span class="comment">// 1. 对象.属性 = 值</span></span><br><span class="line"><span class="variable language_">document</span>.<span class="title function_">write</span>(num1.<span class="property">age</span> = <span class="number">20</span>)</span><br><span class="line"><span class="comment">// 2. 对象.方法 = function() &#123;&#125;</span></span><br><span class="line">num3.<span class="property">say</span> = <span class="keyword">function</span>(<span class="params"></span>) &#123;</span><br><span class="line">    <span class="variable language_">document</span>.<span class="title function_">write</span>(<span class="number">3</span>)</span><br><span class="line">&#125; </span><br><span class="line">num3.<span class="title function_">say2</span>()</span><br></pre></td></tr></table></figure><h5 id="3-删除属性-了解"><a href="#3-删除属性-了解" class="headerlink" title="3. 删除属性(了解)"></a>3. 删除属性(了解)</h5><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">delete</span> num3.<span class="property">sex</span></span><br></pre></td></tr></table></figure><h3 id="3-遍历对象"><a href="#3-遍历对象" class="headerlink" title="3. 遍历对象"></a>3. 遍历对象</h3><ol><li>对象没有length属性没有下标, 无法确定长度</li><li>主要用for in来遍历对象, 不用它来遍历数组</li></ol><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">let</span> num1 = &#123;</span><br><span class="line">    <span class="attr">uname</span>: <span class="string">&#x27;小明&#x27;</span>,</span><br><span class="line">    <span class="attr">age</span>: <span class="number">12</span>,</span><br><span class="line">    <span class="attr">sex</span>: <span class="string">&#x27;男&#x27;</span></span><br><span class="line">&#125;</span><br><span class="line"><span class="comment">// 变量名 k 或者key value</span></span><br><span class="line"><span class="comment">// 代入法: k 本身存的就是属性名 k = &#x27;sex&#x27;</span></span><br><span class="line"><span class="keyword">for</span> (<span class="keyword">let</span> k <span class="keyword">in</span> num1) &#123;</span><br><span class="line">    <span class="variable language_">document</span>.<span class="title function_">write</span>(num1[k])</span><br><span class="line">    <span class="comment">// document.write(k) // 属性名</span></span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure><h5 id="1-遍历数组对象"><a href="#1-遍历数组对象" class="headerlink" title="1. 遍历数组对象"></a>1. 遍历数组对象</h5><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 数组可以放任何数据类型</span></span><br><span class="line"><span class="keyword">let</span> num1 = [</span><br><span class="line">    &#123;<span class="attr">uname</span>: <span class="string">&#x27;小红&#x27;</span>, <span class="attr">age</span>: <span class="number">18</span>, <span class="attr">sex</span>: <span class="string">&#x27;女&#x27;</span>, <span class="attr">home</span>: <span class="string">&#x27;广东省&#x27;</span>&#125;,</span><br><span class="line">    &#123;<span class="attr">uname</span>: <span class="string">&#x27;小刚&#x27;</span>, <span class="attr">age</span>: <span class="number">19</span>, <span class="attr">sex</span>: <span class="string">&#x27;男&#x27;</span>, <span class="attr">home</span>: <span class="string">&#x27;河南省&#x27;</span>&#125;,</span><br><span class="line">]</span><br><span class="line"><span class="comment">// 里面每一个对象都是数组里的元素 值 </span></span><br><span class="line"><span class="keyword">for</span> (<span class="keyword">let</span> key <span class="keyword">in</span> num1) &#123; <span class="comment">// 遍历数组</span></span><br><span class="line">    <span class="variable language_">document</span>.<span class="title function_">write</span>(num1[key].<span class="property">uname</span>)</span><br><span class="line">    <span class="variable language_">document</span>.<span class="title function_">write</span>(num1[key].<span class="property">age</span>)</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure><h5 id="2-遍历数组对象-根据数据渲染生成表格"><a href="#2-遍历数组对象-根据数据渲染生成表格" class="headerlink" title="2. 遍历数组对象: 根据数据渲染生成表格"></a>2. 遍历数组对象: 根据数据渲染生成表格</h5><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">let</span> num1 = [</span><br><span class="line">    &#123;<span class="attr">uname</span>: <span class="string">&#x27;小红&#x27;</span>, <span class="attr">age</span>: <span class="number">18</span>, <span class="attr">sex</span>: <span class="string">&#x27;女&#x27;</span>, <span class="attr">home</span>: <span class="string">&#x27;广东省&#x27;</span>&#125;,</span><br><span class="line">    &#123;<span class="attr">uname</span>: <span class="string">&#x27;小刚&#x27;</span>, <span class="attr">age</span>: <span class="number">19</span>, <span class="attr">sex</span>: <span class="string">&#x27;男&#x27;</span>, <span class="attr">home</span>: <span class="string">&#x27;河南省&#x27;</span>&#125;,</span><br><span class="line">]</span><br><span class="line"><span class="variable language_">document</span>.<span class="title function_">write</span>(<span class="string">`</span></span><br><span class="line"><span class="string">    &lt;table&gt;</span></span><br><span class="line"><span class="string">       &lt;caption&gt;学生列表&lt;/caption&gt;</span></span><br><span class="line"><span class="string">       &lt;tr&gt;</span></span><br><span class="line"><span class="string">           &lt;th&gt;序号&lt;/th&gt;</span></span><br><span class="line"><span class="string">           &lt;th&gt;姓名&lt;/th&gt;</span></span><br><span class="line"><span class="string">           &lt;th&gt;年龄&lt;/th&gt;</span></span><br><span class="line"><span class="string">           &lt;th&gt;性别&lt;/th&gt;</span></span><br><span class="line"><span class="string">           &lt;th&gt;家乡&lt;/th&gt;</span></span><br><span class="line"><span class="string">       &lt;/tr&gt; </span></span><br><span class="line"><span class="string">`</span>)</span><br><span class="line"><span class="keyword">for</span> (<span class="keyword">let</span> num2 = <span class="number">0</span>; num2 &lt; num1.<span class="property">length</span>; num2++) &#123;</span><br><span class="line">    <span class="variable language_">document</span>.<span class="title function_">write</span>(<span class="string">`</span></span><br><span class="line"><span class="string">        &lt;tr&gt;</span></span><br><span class="line"><span class="string">            &lt;td&gt;<span class="subst">$&#123;num2 + <span class="number">1</span>&#125;</span>&lt;/td&gt;</span></span><br><span class="line"><span class="string">            &lt;td&gt;<span class="subst">$&#123;num1[num2].uname&#125;</span>&lt;/td&gt;</span></span><br><span class="line"><span class="string">            &lt;td&gt;<span class="subst">$&#123;num1[num2].age&#125;</span>&lt;/td&gt;</span></span><br><span class="line"><span class="string">            &lt;td&gt;<span class="subst">$&#123;num1[num2].sex&#125;</span>&lt;/td&gt;</span></span><br><span class="line"><span class="string">            &lt;td&gt;<span class="subst">$&#123;num1[num2].home&#125;</span>&lt;/td&gt;</span></span><br><span class="line"><span class="string">        &lt;/tr&gt; </span></span><br><span class="line"><span class="string">    `</span>)</span><br><span class="line">&#125;</span><br><span class="line"><span class="variable language_">document</span>.<span class="title function_">write</span>(<span class="string">`&lt;/table&gt;`</span>)</span><br></pre></td></tr></table></figure><h3 id="4-内置对象"><a href="#4-内置对象" class="headerlink" title="4. 内置对象"></a>4. 内置对象</h3><ol><li>JS内部提供的对象, 各种属性和方法供开发者调用</li><li>Math对象是JS提供的 ‘数学高手’ 对象, 提供一系列数学运算方法</li></ol><h3 id="5-Math对象方法："><a href="#5-Math对象方法：" class="headerlink" title="5. Math对象方法："></a>5. Math对象方法：</h3><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 1.圆周率</span></span><br><span class="line"><span class="variable language_">document</span>.<span class="title function_">write</span>(<span class="title class_">Math</span>.<span class="property">PI</span>)</span><br><span class="line"><span class="comment">// 2.随机数 返回是小数 能得到0 得不到1</span></span><br><span class="line"><span class="variable language_">document</span>.<span class="title function_">write</span>(<span class="title class_">Math</span>.<span class="title function_">random</span>())</span><br><span class="line"><span class="comment">// 3.向上取整 返回是整数</span></span><br><span class="line"><span class="variable language_">document</span>.<span class="title function_">write</span>(<span class="title class_">Math</span>.<span class="title function_">ceil</span>(<span class="number">1.5</span>))</span><br><span class="line"><span class="comment">// 4.floor 向下取整 round 就近取整</span></span><br><span class="line"><span class="variable language_">document</span>.<span class="title function_">write</span>(<span class="title class_">Math</span>.<span class="title function_">floor</span>(<span class="number">1.5</span>))</span><br><span class="line"><span class="variable language_">document</span>.<span class="title function_">write</span>(<span class="title class_">Math</span>.<span class="title function_">round</span>(-<span class="number">1.6</span>))</span><br><span class="line"><span class="comment">// 5.找最大数</span></span><br><span class="line"><span class="variable language_">document</span>.<span class="title function_">write</span>(<span class="title class_">Math</span>.<span class="title function_">max</span>(<span class="number">5</span>,<span class="number">2</span>,<span class="number">1</span>))</span><br><span class="line"><span class="comment">// 6.找最小数</span></span><br><span class="line"><span class="variable language_">document</span>.<span class="title function_">write</span>(<span class="title class_">Math</span>.<span class="title function_">min</span>(<span class="number">5</span>,<span class="number">2</span>,<span class="number">1</span>))</span><br><span class="line"><span class="comment">// pow：幂运算  2. abs：绝对值...</span></span><br></pre></td></tr></table></figure><ol><li><h5 id="生成0-10的随机数"><a href="#生成0-10的随机数" class="headerlink" title="生成0-10的随机数"></a>生成0-10的随机数</h5></li></ol><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="title class_">Math</span>.<span class="title function_">floor</span>(<span class="title class_">Math</span>.<span class="title function_">random</span>() * (<span class="number">10</span> + <span class="number">1</span>))</span><br></pre></td></tr></table></figure><ol start="2"><li><h5 id="生成5-10的随机数"><a href="#生成5-10的随机数" class="headerlink" title="生成5-10的随机数"></a>生成5-10的随机数</h5></li></ol><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="title class_">Math</span>.<span class="title function_">floor</span>(<span class="title class_">Math</span>.<span class="title function_">random</span>() * (<span class="number">5</span> + <span class="number">1</span>)) + <span class="number">5</span></span><br></pre></td></tr></table></figure><ol start="3"><li><h5 id="生成N-N之间的随机数"><a href="#生成N-N之间的随机数" class="headerlink" title="生成N-N之间的随机数"></a>生成N-N之间的随机数</h5></li></ol><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line"><span class="title class_">Math</span>.<span class="title function_">floor</span>(<span class="title class_">Math</span>.<span class="title function_">random</span>() * (M - N + <span class="number">1</span>)) + N</span><br><span class="line"><span class="variable language_">document</span>.<span class="title function_">write</span>(<span class="title class_">Math</span>.<span class="title function_">floor</span>(<span class="title class_">Math</span>.<span class="title function_">random</span>() * (<span class="number">10</span> - <span class="number">1</span> + <span class="number">1</span>) + <span class="number">1</span>))</span><br><span class="line"><span class="comment">// 函数封装法</span></span><br><span class="line"><span class="keyword">function</span> <span class="title function_">fn</span>(<span class="params">min, max</span>) &#123;</span><br><span class="line">    <span class="keyword">return</span> <span class="title class_">Math</span>.<span class="title function_">floor</span>(<span class="title class_">Math</span>.<span class="title function_">random</span>() * (max - min - min) + min)</span><br><span class="line">&#125;</span><br><span class="line"><span class="keyword">let</span> re = <span class="title function_">fn</span>(<span class="number">1</span>, <span class="number">10</span>)</span><br><span class="line"><span class="variable language_">document</span>.<span class="title function_">write</span>(re)</span><br></pre></td></tr></table></figure><h5 id="4-随机点名"><a href="#4-随机点名" class="headerlink" title="4. 随机点名"></a>4. 随机点名</h5><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// floor random 随机显示数组里名字</span></span><br><span class="line"><span class="keyword">function</span> <span class="title function_">fn</span>(<span class="params">min, max</span>) &#123;</span><br><span class="line">    <span class="keyword">return</span> <span class="title class_">Math</span>.<span class="title function_">floor</span>(<span class="title class_">Math</span>.<span class="title function_">random</span>() * (max - min - min) + min)</span><br><span class="line">&#125;</span><br><span class="line"><span class="keyword">let</span> num1 = [<span class="string">&#x27;赵云&#x27;</span>, <span class="string">&#x27;黄忠&#x27;</span>, <span class="string">&#x27;张飞&#x27;</span>, <span class="string">&#x27;马超&#x27;</span>, <span class="string">&#x27;曹操&#x27;</span>, <span class="string">&#x27;刘备&#x27;</span>]</span><br><span class="line"><span class="comment">// 调用函数随机数 生成1个随机数 作为数组索引号</span></span><br><span class="line"><span class="keyword">let</span> num2 = <span class="title function_">fn</span>(<span class="number">0</span>, num1.<span class="property">length</span> - <span class="number">1</span>)</span><br><span class="line"><span class="variable language_">document</span>.<span class="title function_">write</span>(num1[num2])</span><br></pre></td></tr></table></figure><h5 id="5-随机点名-改进版-点完名后不重复"><a href="#5-随机点名-改进版-点完名后不重复" class="headerlink" title="5. 随机点名 (改进版: 点完名后不重复)"></a>5. 随机点名 (改进版: 点完名后不重复)</h5><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 点名后不重复点名 删除它</span></span><br><span class="line"><span class="comment">// 数组中删除刚才抽中的索引号</span></span><br><span class="line">num1.<span class="title function_">splice</span>(num2, <span class="number">1</span>)</span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(num1)</span><br></pre></td></tr></table></figure><h5 id="6-猜数字游戏"><a href="#6-猜数字游戏" class="headerlink" title="6. 猜数字游戏"></a>6. 猜数字游戏</h5><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 用户输入一个数 生成1 ~ 10之间的随机数</span></span><br><span class="line"><span class="keyword">let</span> num1 = <span class="title function_">fn</span>(<span class="number">1</span>, <span class="number">10</span>)</span><br><span class="line"><span class="keyword">while</span> (<span class="literal">true</span>) &#123;</span><br><span class="line"><span class="comment">// 无限弹窗 直到输入正确为止</span></span><br><span class="line">    <span class="keyword">let</span> num2 = +<span class="title function_">prompt</span>(<span class="string">&#x27;请输入您猜的数字&#x27;</span>)</span><br><span class="line">    <span class="keyword">if</span> (num1 &lt; num2) &#123;</span><br><span class="line">        <span class="title function_">alert</span>(<span class="string">&#x27;你猜大了, 继续猜吧!&#x27;</span>)</span><br><span class="line">    &#125; <span class="keyword">else</span> <span class="keyword">if</span> (num1 &gt; num2) &#123;</span><br><span class="line">        <span class="title function_">alert</span>(<span class="string">&#x27;你猜小了, 继续猜吧!&#x27;</span>)</span><br><span class="line">    &#125; <span class="keyword">else</span> &#123;</span><br><span class="line">        <span class="title function_">alert</span>(<span class="string">&#x27;恭喜您猜对了!&#x27;</span>)</span><br><span class="line">        <span class="keyword">break</span></span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure><h5 id="7-学成在线页面渲染"><a href="#7-学成在线页面渲染" class="headerlink" title="7. 学成在线页面渲染"></a>7. 学成在线页面渲染</h5><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br></pre></td><td class="code"><pre><span class="line">&lt;div <span class="keyword">class</span>=<span class="string">&quot;box w&quot;</span>&gt;</span><br><span class="line">    <span class="language-xml"><span class="tag">&lt;<span class="name">div</span> <span class="attr">class</span>=<span class="string">&quot;box-hd&quot;</span>&gt;</span></span></span><br><span class="line"><span class="language-xml">        <span class="tag">&lt;<span class="name">h3</span>&gt;</span>精品推荐<span class="tag">&lt;/<span class="name">h3</span>&gt;</span></span></span><br><span class="line"><span class="language-xml">        <span class="tag">&lt;<span class="name">a</span> <span class="attr">href</span>=<span class="string">&quot;&quot;</span>&gt;</span>查看全部<span class="tag">&lt;/<span class="name">a</span>&gt;</span></span></span><br><span class="line"><span class="language-xml">    <span class="tag">&lt;/<span class="name">div</span>&gt;</span></span></span><br><span class="line">    <span class="language-xml"><span class="tag">&lt;<span class="name">div</span> <span class="attr">class</span>=<span class="string">&quot;box-bd&quot;</span>&gt;</span></span></span><br><span class="line"><span class="language-xml">        <span class="tag">&lt;<span class="name">ul</span> <span class="attr">class</span>=<span class="string">&quot;clearfix&quot;</span>&gt;</span></span></span><br><span class="line"><span class="language-xml">            <span class="tag">&lt;<span class="name">script</span>&gt;</span><span class="language-handlebars"><span class="language-xml"></span></span></span></span><br><span class="line"><span class="language-xml"><span class="language-handlebars"><span class="language-xml">                let data = [</span></span></span></span><br><span class="line"><span class="language-xml"><span class="language-handlebars"><span class="language-xml">                    &#123;</span></span></span></span><br><span class="line"><span class="language-xml"><span class="language-handlebars"><span class="language-xml">                        src: &#x27;images/course01.png&#x27;,</span></span></span></span><br><span class="line"><span class="language-xml"><span class="language-handlebars"><span class="language-xml">                        title: &#x27;Think PHP 5.0 博客系统实战项目演练&#x27;,</span></span></span></span><br><span class="line"><span class="language-xml"><span class="language-handlebars"><span class="language-xml">                        num: 1125</span></span></span></span><br><span class="line"><span class="language-xml"><span class="language-handlebars"><span class="language-xml">                    &#125;</span></span></span></span><br><span class="line"><span class="language-xml"><span class="language-handlebars"><span class="language-xml">                ]</span></span></span></span><br><span class="line"><span class="language-xml"><span class="language-handlebars"><span class="language-xml">                // 根据data数据个数渲染有多少个li</span></span></span></span><br><span class="line"><span class="language-xml"><span class="language-handlebars"><span class="language-xml">                for (let num = 0; num &lt; data.length; num++) &#123;</span></span></span></span><br><span class="line"><span class="language-xml"><span class="language-handlebars"><span class="language-xml">                    document.write(`</span></span></span></span><br><span class="line"><span class="language-xml"><span class="language-handlebars"><span class="language-xml">                    <span class="tag">&lt;<span class="name">li</span>&gt;</span></span></span></span></span><br><span class="line"><span class="language-xml"><span class="language-handlebars"><span class="language-xml">                         <span class="tag">&lt;<span class="name">img</span> <span class="attr">src</span>=<span class="string">$&#123;data[num].src&#125;</span>&gt;</span></span></span></span></span><br><span class="line"><span class="language-xml"><span class="language-handlebars"><span class="language-xml">                         <span class="tag">&lt;<span class="name">h4</span>&gt;</span>$&#123;data[num].title&#125;<span class="tag">&lt;/<span class="name">h4</span>&gt;</span></span></span></span></span><br><span class="line"><span class="language-xml"><span class="language-handlebars"><span class="language-xml">                         <span class="tag">&lt;<span class="name">div</span> <span class="attr">class</span>=<span class="string">&quot;info&quot;</span>&gt;</span></span></span></span></span><br><span class="line"><span class="language-xml"><span class="language-handlebars"><span class="language-xml">                         <span class="tag">&lt;<span class="name">span</span>&gt;</span>高级<span class="tag">&lt;/<span class="name">span</span>&gt;</span> • <span class="tag">&lt;<span class="name">span</span>&gt;</span>$&#123;data[num].num&#125;<span class="tag">&lt;/<span class="name">span</span>&gt;</span>人在学习</span></span></span></span><br><span class="line"><span class="language-xml"><span class="language-handlebars"><span class="language-xml">                         <span class="tag">&lt;/<span class="name">div</span>&gt;</span></span></span></span></span><br><span class="line"><span class="language-xml"><span class="language-handlebars"><span class="language-xml">                    <span class="tag">&lt;/<span class="name">li</span>&gt;</span></span></span></span></span><br><span class="line"><span class="language-xml"><span class="language-handlebars"><span class="language-xml">                    `)</span></span></span></span><br><span class="line"><span class="language-xml"><span class="language-handlebars"><span class="language-xml">                &#125;</span></span></span></span><br><span class="line"><span class="language-xml"><span class="language-handlebars"><span class="language-xml">            </span></span><span class="tag">&lt;/<span class="name">script</span>&gt;</span></span></span><br><span class="line"><span class="language-xml">        <span class="tag">&lt;/<span class="name">ul</span>&gt;</span></span></span><br><span class="line"><span class="language-xml">    <span class="tag">&lt;/<span class="name">div</span>&gt;</span></span></span><br><span class="line"><span class="language-xml"><span class="tag">&lt;/<span class="name">div</span>&gt;</span></span></span><br></pre></td></tr></table></figure><h3 id="6-术语解释"><a href="#6-术语解释" class="headerlink" title="6. 术语解释"></a>6. 术语解释</h3><table><thead><tr><th align="left">术语</th><th align="left">解释</th><th align="left">举例</th></tr></thead><tbody><tr><td align="left">关键字</td><td align="left">在JS中有特殊意义的词汇</td><td align="left">let、var、function、if、else、switch、case、break</td></tr><tr><td align="left">保留字</td><td align="left">目前JS中没意义, 以后具有特殊意义的词汇</td><td align="left">int、short、long、char</td></tr><tr><td align="left">标识符</td><td align="left">变量名、函数名另一种叫法</td><td align="left">无</td></tr><tr><td align="left">表达式</td><td align="left">能产生值的代码, 配合运算符出现</td><td align="left">10+3、age &gt;&#x3D; 18</td></tr><tr><td align="left">语句</td><td align="left">按用途会分类: 输出、声明、 分支语句</td><td align="left">无</td></tr></tbody></table><h4 id="1-基本数据和引用数据类型"><a href="#1-基本数据和引用数据类型" class="headerlink" title="1. 基本数据和引用数据类型"></a>1. 基本数据和引用数据类型</h4><ol><li>简单类型又叫基本数据或值类型, 复杂类型又叫引用类型</li><li>值类型: 简单数据&#x2F;基本数据, 在存储时变量中存储的是值本身, 因此叫值类型</li><li>引用类型: 复杂数据, 在存储时变量中存储的仅仅是地址(引用), 因此叫引用数据类型 <img src="" data-lazy-src="https://npm.elemecdn.com/webxc/post/%E5%9F%BA%E6%9C%AC%E6%95%B0%E6%8D%AE%E7%B1%BB%E5%9E%8B%E5%92%8C%E5%BC%95%E7%94%A8%E6%95%B0%E6%8D%AE%E7%B1%BB%E5%9E%8B.jpg" style="zoom:33%"></li></ol><h4 id="2-堆-x2F-栈-空间分配区别："><a href="#2-堆-x2F-栈-空间分配区别：" class="headerlink" title="2. 堆&#x2F;栈 空间分配区别："></a>2. 堆&#x2F;栈 空间分配区别：</h4><ol><li>简单数据类型存放到栈里 2. 引用数据类型存放到堆里</li><li>栈(操作系统): 由操作系统自动分配存放函数的参数值、局部变量的值等, 操作方式类似于数据结构中的栈</li><li>堆(操作系统): 存储复杂类型(对象), 由程序员分配释放, 若不释放, 由垃圾回收机制回收</li></ol><h4 id="3-简单类型的内存分配"><a href="#3-简单类型的内存分配" class="headerlink" title="3. 简单类型的内存分配"></a>3. 简单类型的内存分配</h4><ol><li>值类型(简单数据类型): string、number、boolean、undefined、null</li><li>值类型变量的数据直接存放在变量(栈空间)中<img src="" data-lazy-src="https://npm.elemecdn.com/webxc/post/%E7%AE%80%E5%8D%95%E7%B1%BB%E5%9E%8B%E7%9A%84%E5%86%85%E5%AD%98%E5%88%86%E9%85%8D.jpg" style="zoom:33%"><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 简单数据类型存储值 10</span></span><br><span class="line"><span class="keyword">let</span> num1 = <span class="number">10</span></span><br><span class="line"><span class="keyword">let</span> num2 = num1</span><br><span class="line">num2 = <span class="number">20</span></span><br><span class="line"><span class="variable language_">document</span>.<span class="title function_">write</span>(num1)</span><br></pre></td></tr></table></figure></li></ol><h4 id="4-复杂类型的内存分配"><a href="#4-复杂类型的内存分配" class="headerlink" title="4. 复杂类型的内存分配"></a>4. 复杂类型的内存分配</h4><ol><li>引用类型(复杂数据类型): 通过new关键字创建的对象(系统对象、自定义对象) 如Object、Array、Date…</li><li>引用类型变量(栈空间)里存放的是地址, 真正的对象实例存放在堆空间中 <img src="" data-lazy-src="https://npm.elemecdn.com/webxc/post/%E5%A4%8D%E6%9D%82%E7%B1%BB%E5%9E%8B%E7%9A%84%E5%86%85%E5%AD%98%E5%88%86%E9%85%8D.jpg" style="zoom:33%"></li></ol><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 对象 引用数据类型 栈里存储的是地址 20</span></span><br><span class="line"><span class="keyword">let</span> obj1 = &#123;</span><br><span class="line">    <span class="attr">age</span>: <span class="number">10</span></span><br><span class="line">&#125;</span><br><span class="line"><span class="keyword">let</span> obj2 = obj1</span><br><span class="line">obj2.<span class="property">age</span> = <span class="number">20</span></span><br><span class="line"><span class="comment">// 因为它们是复杂数据类型 栈都指向同一地址</span></span><br><span class="line"><span class="variable language_">document</span>.<span class="title function_">write</span>(obj1.<span class="property">age</span>, obj2.<span class="property">age</span>)</span><br></pre></td></tr></table></figure><hr><h4 id="本节单词"><a href="#本节单词" class="headerlink" title="本节单词:"></a>本节单词:</h4><ol><li>key、value</li><li>in</li><li>math</li><li>object</li><li>PI、random、ceil、floor、round、max、min</li><li>uname、age、sex、goods、address、weight</li><li>dir</li><li>delete</li></ol></article><div class="post-copyright"><div class="post-copyright__author"><span class="post-copyright-meta">本文作者:</span> <span 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class="toc-content"><ol class="toc"><li class="toc-item toc-level-3"><a class="toc-link" href="#1-%E4%BB%80%E4%B9%88%E6%98%AF%E5%AF%B9%E8%B1%A1"><span class="toc-number">1.</span> <span class="toc-text">1. 什么是对象:</span></a><ol class="toc-child"><li class="toc-item toc-level-4"><a class="toc-link" href="#1-%E5%AF%B9%E8%B1%A1%E6%98%AF%E5%B1%9E%E6%80%A7%E5%92%8C%E6%96%B9%E6%B3%95%E7%BB%84%E6%88%90"><span class="toc-number">1.1.</span> <span class="toc-text">1. 对象是属性和方法组成:</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#2-%E5%B1%9E%E6%80%A7%E8%AE%BF%E9%97%AE"><span class="toc-number">1.2.</span> <span class="toc-text">2. 属性访问:</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#3-%E5%AF%B9%E8%B1%A1%E4%B8%AD%E7%9A%84%E6%96%B9%E6%B3%95%E5%92%8C%E8%AE%BF%E9%97%AE"><span class="toc-number">1.3.</span> <span class="toc-text">3. 对象中的方法和访问:</span></a></li></ol></li><li class="toc-item toc-level-3"><a class="toc-link" href="#2-%E6%93%8D%E4%BD%9C%E5%AF%B9%E8%B1%A1"><span class="toc-number">2.</span> <span class="toc-text">2. 操作对象</span></a><ol class="toc-child"><li class="toc-item toc-level-5"><a class="toc-link" href="#1-%E5%A2%9E%E5%8A%A0%E5%AF%B9%E8%B1%A1%E5%B1%9E%E6%80%A7"><span class="toc-number">2.0.1.</span> <span class="toc-text">1. 增加对象属性</span></a></li><li class="toc-item toc-level-5"><a class="toc-link" href="#2-%E9%87%8D%E6%96%B0%E8%B5%8B%E5%80%BC%E5%AF%B9%E8%B1%A1%E5%B1%9E%E6%80%A7"><span class="toc-number">2.0.2.</span> <span class="toc-text">2. 重新赋值对象属性</span></a></li><li class="toc-item toc-level-5"><a class="toc-link" href="#3-%E5%88%A0%E9%99%A4%E5%B1%9E%E6%80%A7-%E4%BA%86%E8%A7%A3"><span class="toc-number">2.0.3.</span> <span class="toc-text">3. 删除属性(了解)</span></a></li></ol></li></ol><li class="toc-item toc-level-3"><a class="toc-link" href="#3-%E9%81%8D%E5%8E%86%E5%AF%B9%E8%B1%A1"><span class="toc-number">3.</span> <span class="toc-text">3. 遍历对象</span></a><ol class="toc-child"><li class="toc-item toc-level-5"><a class="toc-link" href="#1-%E9%81%8D%E5%8E%86%E6%95%B0%E7%BB%84%E5%AF%B9%E8%B1%A1"><span class="toc-number">3.0.1.</span> <span class="toc-text">1. 遍历数组对象</span></a></li><li class="toc-item toc-level-5"><a class="toc-link" href="#2-%E9%81%8D%E5%8E%86%E6%95%B0%E7%BB%84%E5%AF%B9%E8%B1%A1-%E6%A0%B9%E6%8D%AE%E6%95%B0%E6%8D%AE%E6%B8%B2%E6%9F%93%E7%94%9F%E6%88%90%E8%A1%A8%E6%A0%BC"><span class="toc-number">3.0.2.</span> <span class="toc-text">2. 遍历数组对象: 根据数据渲染生成表格</span></a></li></ol></li><li class="toc-item toc-level-3"><a class="toc-link" href="#4-%E5%86%85%E7%BD%AE%E5%AF%B9%E8%B1%A1"><span class="toc-number">4.</span> <span class="toc-text">4. 内置对象</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#5-Math%E5%AF%B9%E8%B1%A1%E6%96%B9%E6%B3%95%EF%BC%9A"><span class="toc-number">5.</span> <span class="toc-text">5. Math对象方法：</span></a><ol class="toc-child"><li class="toc-item toc-level-5"><a class="toc-link" href="#%E7%94%9F%E6%88%900-10%E7%9A%84%E9%9A%8F%E6%9C%BA%E6%95%B0"><span class="toc-number">5.0.1.</span> <span class="toc-text">生成0-10的随机数</span></a></li><li class="toc-item toc-level-5"><a class="toc-link" href="#%E7%94%9F%E6%88%905-10%E7%9A%84%E9%9A%8F%E6%9C%BA%E6%95%B0"><span class="toc-number">5.0.2.</span> <span class="toc-text">生成5-10的随机数</span></a></li><li class="toc-item toc-level-5"><a class="toc-link" href="#%E7%94%9F%E6%88%90N-N%E4%B9%8B%E9%97%B4%E7%9A%84%E9%9A%8F%E6%9C%BA%E6%95%B0"><span class="toc-number">5.0.3.</span> <span class="toc-text">生成N-N之间的随机数</span></a></li><li class="toc-item toc-level-5"><a class="toc-link" href="#4-%E9%9A%8F%E6%9C%BA%E7%82%B9%E5%90%8D"><span class="toc-number">5.0.4.</span> <span class="toc-text">4. 随机点名</span></a></li><li class="toc-item toc-level-5"><a class="toc-link" href="#5-%E9%9A%8F%E6%9C%BA%E7%82%B9%E5%90%8D-%E6%94%B9%E8%BF%9B%E7%89%88-%E7%82%B9%E5%AE%8C%E5%90%8D%E5%90%8E%E4%B8%8D%E9%87%8D%E5%A4%8D"><span class="toc-number">5.0.5.</span> <span class="toc-text">5. 随机点名 (改进版: 点完名后不重复)</span></a></li><li class="toc-item toc-level-5"><a class="toc-link" href="#6-%E7%8C%9C%E6%95%B0%E5%AD%97%E6%B8%B8%E6%88%8F"><span class="toc-number">5.0.6.</span> <span class="toc-text">6. 猜数字游戏</span></a></li><li class="toc-item toc-level-5"><a class="toc-link" href="#7-%E5%AD%A6%E6%88%90%E5%9C%A8%E7%BA%BF%E9%A1%B5%E9%9D%A2%E6%B8%B2%E6%9F%93"><span class="toc-number">5.0.7.</span> <span class="toc-text">7. 学成在线页面渲染</span></a></li></ol></li><li class="toc-item toc-level-3"><a class="toc-link" href="#6-%E6%9C%AF%E8%AF%AD%E8%A7%A3%E9%87%8A"><span class="toc-number">6.</span> <span class="toc-text">6. 术语解释</span></a><ol class="toc-child"><li class="toc-item toc-level-4"><a class="toc-link" href="#1-%E5%9F%BA%E6%9C%AC%E6%95%B0%E6%8D%AE%E5%92%8C%E5%BC%95%E7%94%A8%E6%95%B0%E6%8D%AE%E7%B1%BB%E5%9E%8B"><span class="toc-number">6.1.</span> <span class="toc-text">1. 基本数据和引用数据类型</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#2-%E5%A0%86-x2F-%E6%A0%88-%E7%A9%BA%E9%97%B4%E5%88%86%E9%85%8D%E5%8C%BA%E5%88%AB%EF%BC%9A"><span class="toc-number">6.2.</span> <span class="toc-text">2. 堆&#x2F;栈 空间分配区别：</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#3-%E7%AE%80%E5%8D%95%E7%B1%BB%E5%9E%8B%E7%9A%84%E5%86%85%E5%AD%98%E5%88%86%E9%85%8D"><span class="toc-number">6.3.</span> <span class="toc-text">3. 简单类型的内存分配</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#4-%E5%A4%8D%E6%9D%82%E7%B1%BB%E5%9E%8B%E7%9A%84%E5%86%85%E5%AD%98%E5%88%86%E9%85%8D"><span class="toc-number">6.4.</span> <span class="toc-text">4. 复杂类型的内存分配</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#%E6%9C%AC%E8%8A%82%E5%8D%95%E8%AF%8D"><span class="toc-number">6.5.</span> <span class="toc-text">本节单词:</span></a></li></ol></li></div></div><div class="card-widget card-recent-post"><div class="item-headline"><i class="fas fa-history"></i><span>最新文章</span></div><div class="aside-list"><div class="aside-list-item"><a class="thumbnail" href="/post/ds2s/" title="整个前端面试题"><img src="https://cdn1.tianli0.top/gh/web-xc/iMG/postss/vue.png" onerror='this.onerror=null,this.src="https://npm.elemecdn.com/webxc@1.0.2/banner/404.gif"' alt="整个前端面试题"></a><div class="content"><a class="title" href="/post/ds2s/" title="整个前端面试题">整个前端面试题</a><time datetime="2023-08-31T02:00:00.000Z" title="发表于 2023-08-31 02:00:00">2023-08-31</time></div></div><div class="aside-list-item"><a class="thumbnail" href="/post/ds23/" title="常见前端面试题"><img src="https://cdn1.tianli0.top/gh/web-xc/iMG/postss/vue.png" onerror='this.onerror=null,this.src="https://npm.elemecdn.com/webxc@1.0.2/banner/404.gif"' 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